Hello,
I would particularly appreciate a technical response from Victron regarding the following behavior of my charge controller. I would like to know whether this is normal operation or a fault that should be addressed under warranty.
I have four Victron SmartSolar charge controllers installed:
- 3× MPPT 250/85 – in operation for approximately 1 year
- 1× MPPT 250/100 – in operation for approximately 6 months
All four controllers are running on firmware version 3.18 and are connected via VE.Can.
I have problem only with the MPPT 250/100.
During the day, the controller operates normally and charges the battery as expected. However, at night, it shows approximately 52 V - 55V at the PV input, even in complete darkness.
This voltage is approximately equal to the actual battery voltage.
The other three MPPT 250/85 controllers show approximately 0–1 V at their PV inputs under the same conditions.
The MPPT 250/100 reports no errors.
What I have tested:
- I verified the approximately 52-55 V at the PV input using a multimeter. Therefore, this is not just an incorrect reading in VRM.
- I disconnected the solar panels from the MPPT 250/100 using the DC isolator. The voltage at the PV input remained at approximately 52-55 V, even with the panels disconnected.
- I then disconnected the controller from the battery for maybe 30seconds. The voltage at the PV input disappeared.
- After reconnecting the battery, approximately 52-55 V appeared at the PV input again. Restarting the controller did not resolve the issue.
PV array connected to the MPPT 250/100:
- 8× panels 4s2p, 3760Wp, 48V battery system
My questions, particularly for the Victron technical team:
- Is this behavior normal for the MPPT 250/100, or is it a known symptom of a hardware fault?
- Could this be caused by a damaged power MOSFET or another internal component?
- Is it safe?
It is normal behavior or i need for warranty claim?
Thank you for your response.
